## [1] "Run Completed at 2018-02-06 16:58:57"
\[ Yobs_{i,j} \sim Bernoulli(N(0,1.68)) \]
Note that this is a random probability of interaction on a per observation basis. This is different than a random link model. If we are interested in a binary network, a random interaction probability model will lead to a link probability of 1-(1/2)^n in n sampling events.
## sink("models/SpeciesIdentity.jags")
## cat("
## model {
##
## for (x in 1:Nobs){
##
## #observation
## logit(s[x])<-alpha[Bird[x],Plant[x]]
## Yobs[x] ~ dbern(s[x])
##
## #Observed discrepancy
## E[x]<-abs(Yobs[x]- s[x])
## }
##
## #Assess Model Fit - Predict remaining data
## for(x in 1:Nnewdata){
##
## #Generate prediction
## logit(snew[x])<-alpha[NewBird[x],NewPlant[x]]
## Ynew_pred[x]~dbern(snew[x])
##
## #Assess fit, proportion of corrected predicted observations
## Enew[x]<-abs(Ynew[x]-Ynew_pred[x])
##
## }
##
## #Priors
##
## #Species level priors
## for (i in 1:Birds){
## for (j in 1:Plants){
##
## #Intercept
## #logit prior, then transform for plotting
## alpha[i,j] ~ dnorm(0,0.386)
## }
## }
##
## #derived posterior check
## fit<-sum(E[]) #Discrepancy for the observed data
## fitnew<-sum(Enew[])
## }
## ",fill=TRUE)
##
## sink()
## Compiling model graph
## Resolving undeclared variables
## Allocating nodes
## Graph information:
## Observed stochastic nodes: 0
## Unobserved stochastic nodes: 50408
## Total graph size: 277604
##
## Initializing model
\[ Yobs_{i,j} \sim Bernoulli(\lambda_{i,j}) \]
## sink("models/SpeciesIdentity.jags")
## cat("
## model {
##
## for (x in 1:Nobs){
##
## #observation
## logit(s[x])<-alpha[Bird[x],Plant[x]]
## Yobs[x] ~ dbern(s[x])
##
## #Observed discrepancy
## E[x]<-abs(Yobs[x]- s[x])
## }
##
## #Assess Model Fit - Predict remaining data
## for(x in 1:Nnewdata){
##
## #Generate prediction
## logit(snew[x])<-alpha[NewBird[x],NewPlant[x]]
## Ynew_pred[x]~dbern(snew[x])
##
## #Assess fit, proportion of corrected predicted observations
## Enew[x]<-abs(Ynew[x]-Ynew_pred[x])
##
## }
##
## #Priors
##
## #Species level priors
## for (i in 1:Birds){
## for (j in 1:Plants){
##
## #Intercept
## #logit prior, then transform for plotting
## alpha[i,j] ~ dnorm(0,0.386)
## }
## }
##
## #derived posterior check
## fit<-sum(E[]) #Discrepancy for the observed data
## fitnew<-sum(Enew[])
## }
## ",fill=TRUE)
##
## sink()
## Compiling model graph
## Resolving undeclared variables
## Allocating nodes
## Graph information:
## Observed stochastic nodes: 21334
## Unobserved stochastic nodes: 29074
## Total graph size: 236996
##
## Initializing model
Observation Model:
\[ Yobs_{i,j,k,d} \sim Binomial(N_{i,j,k},\omega_i) \]
Process Model:
\[ N_{i,j,k} \sim Binomial(\lambda_{i,j}) \] \[ Yobs_{i,j} \sim Bernoulli(\lambda_{i,j}) \]
## sink("models/SpeciesIdentity_Detect.jags")
## cat("
## model {
##
## #Observation Model
## for (x in 1:Nobs){
##
## #Observation Process
## #True state
## z[x] ~ dbern(detect[Bird[x]])
##
## #Observation
## logit(s[x])<-alpha[Bird[x],Plant[x]]
## p[x]<-z[x] * s[x]
## Yobs[x] ~ dbern(p[x])
##
## #Observed discrepancy
## E[x]<-abs(Yobs[x]- s[x])
## }
##
## #Assess Model Fit - Predict remaining data
## for(x in 1:Nnewdata){
##
## #Generate prediction
## znew[x] ~ dbern(detect[NewBird[x]])
## logit(snew[x])<-alpha[NewBird[x],NewPlant[x]]
## pnew[x]<-znew[x]*snew[x]
##
## #Predicted observation
## Ynew_pred[x]~dbern(pnew[x])
##
## #Assess fit, proportion of corrected predicted links
## Enew[x]<-abs(Ynew[x]-Ynew_pred[x])
##
## }
##
## #Priors
## #Observation model
## #Detect priors, logit transformed - Following lunn 2012 p85
## for(x in 1:Birds){
## logit(detect[x])<-dcam[x]
## dcam[x]~dnorm(omega_mu,omega_tau)
## }
##
## #Process Model
## #Species level priors
## for (i in 1:Birds){
## for (j in 1:Plants){
## #Intercept
## #logit prior, then transform for plotting
## alpha[i,j] ~ dnorm(0,0.386)
## }
## }
##
## #OBSERVATION PRIOR
## omega_mu ~ dnorm(0,0.386)
## omega_tau ~ dunif(0,10)
##
## #derived posterior check
## fit<-sum(E[]) #Discrepancy for the observed data
## fitnew<-sum(Enew[])
##
## }
## ",fill=TRUE)
##
## sink()
## Compiling model graph
## Resolving undeclared variables
## Allocating nodes
## Graph information:
## Observed stochastic nodes: 21334
## Unobserved stochastic nodes: 78624
## Total graph size: 336095
##
## Initializing model
# Incorportating species occurrence
If species co-occurrence is a prerequisite for interaction, then the absence of interactions may stem either from a lack of detectability or species absence. We can jointly model the presence of species as a function of elevation and then existance of an interaction.
Observation Model:
\[ Yobs_{i,j,k,d} \sim Binomial(N_{i,j,k},\omega_i) \]
Process Model:
\[ N_{i,j,k} \sim Binomial(\lambda_{i,j}) \] \[ Yobs_{i,j} \sim Bernoulli(\lambda_{i,j}) \]
## sink("models/SpeciesIdentity_Detect_Elevation.jags")
## cat("
## model {
##
## #Observation Model
## for (x in 1:Nobs){
##
## #Occurrence Process
## logit(psi[x])<-alpha_occ[Bird[x]] + beta_occ[Bird[x]] * elevation[x] + beta2_occ[Bird[x]] * elevation[x]^2
## occ[x] ~ dbern(psi[x])
##
## #Is the species available to be detected?
## rho[x]<-detect[Bird[x]]*occ[x]
##
## #Observation Process
## #True state
## z[x] ~ dbern(rho[x])
##
## #observation
## logit(s[x])<-alpha[Bird[x],Plant[x]]
## p[x]<-z[x] * s[x]
## Yobs[x] ~ dbern(p[x])
##
## #Observed discrepancy
## E[x]<-abs(Yobs[x]- s[x])
## }
##
## #Assess Model Fit - Predict remaining data
## for(x in 1:Nnewdata){
##
## #Generate prediction
## #Occurrence Process
## logit(psi_new[x])<-alpha_occ[NewBird[x]] + beta_occ[NewBird[x]] * elevation_new[x]
## occ_new[x] ~ dbern(psi_new[x])
##
## #Is the species present to be detected?
## rho_new[x]<-detect[NewBird[x]]*occ_new[x]
## znew[x] ~ dbern(rho_new[x])
##
## logit(snew[x])<-alpha[NewBird[x],NewPlant[x]]
## pnew[x]<-znew[x]*snew[x]
##
## #Predicted observation
## Ynew_pred[x]~dbern(pnew[x])
##
## #Assess fit, proportion of corrected predicted links
## Enew[x]<-abs(Ynew[x]-Ynew_pred[x])
##
## }
##
## #Priors
## #Note: flat logit priorsm - Following lunn 2012 p85
##
##
## #Occurrence Priors
## for(x in 1:Birds){
## alpha_occ[x] ~ dnorm(0,0.386)
## beta_occ[x] ~ dnorm(0,0.386)
## beta2_occ[x] ~ dnorm(0,0.386)
## }
##
## #Observation model
##
## for(x in 1:Birds){
## logit(detect[x])<-dcam[x]
## dcam[x]~dnorm(omega_mu,omega_tau)
## }
##
##
## #Process Model
## #Species level priors
## for (i in 1:Birds){
## for (j in 1:Plants){
## #Intercept
## #logit prior, then transform for plotting
## alpha[i,j] ~ dnorm(0,0.386)
## }
## }
##
## #OBSERVATION PRIOR
## omega_mu ~ dnorm(0,0.386)
## omega_tau ~ dunif(0,10)
##
## #derived posterior check
## fit<-sum(E[]) #Discrepancy for the observed data
## fitnew<-sum(Enew[])
##
## }
## ",fill=TRUE)
##
## sink()
## Compiling model graph
## Resolving undeclared variables
## Allocating nodes
## Graph information:
## Observed stochastic nodes: 21334
## Unobserved stochastic nodes: 128212
## Total graph size: 507218
##
## Initializing model
## # A tibble: 4 x 4
## # Groups: Model [4]
## Model Presence Absence p
## <chr> <int> <int> <dbl>
## 1 Random 83690 2310 97.3
## 2 Species 69515 16485 80.8
## 3 Species_Detect 41968 44032 48.8
## 4 Species_Detect_Elevation 31294 54706 36.4
## [1] "True presence rate is: 18.8"
Dashed line is the observed network from the time-series.
Dissimilairty in interactions (Beta_WN from Poisot 2012) Dashed line is the observed network from the time-series. Note that this is really a measure of dissimilairty in one level (hummimngbirds), as the dissimilarity in plants is fixed by the sampling protocol. While there be a correlation between the species pool and the chosen plant to film, this is filtered by a human placing a camera at that plant, and as such isn’t a true measure of plant dissimiality.
Create a kind of venn diagram on PCA of model similarity based on per link discrepency.
## # A tibble: 16 x 3
## # Groups: Model [4]
## Model mean pair
## <chr> <dbl> <chr>
## 1 Species_Detect_Elevation -1.00 Violet-tailed Sylph_Begonia longirostr…
## 2 Species_Detect -0.970 Booted Racket-tail_Stromanthe stromant…
## 3 Species_Detect_Elevation -0.935 Booted Racket-tail_Stromanthe stromant…
## 4 Species_Detect -0.915 Brown Inca_Psammisia aberrans
## 5 Species -0.900 Booted Racket-tail_Stromanthe stromant…
## 6 Species_Detect_Elevation -0.892 Brown Inca_Psammisia aberrans
## 7 Species -0.885 Tawny-bellied Hermit_Heliconia griggsi…
## 8 Species_Detect -0.885 Stripe-throated Hermit_Salvia quitensis
## 9 Species_Detect -0.885 Violet-tailed Sylph_Begonia longirostr…
## 10 Species -0.878 Brown Inca_Psammisia aberrans
## 11 Species_Detect_Elevation -0.865 Tawny-bellied Hermit_Centropogon presl…
## 12 Species -0.691 Tawny-bellied Hermit_Columnea strigosa
## 13 Random -0.590 Speckled Hummingbird_Stromanthe stroma…
## 14 Random -0.565 Wedge-billed Hummingbird_Centropogon p…
## 15 Random -0.560 Collared Inca_Psammisia ulbrichiana
## 16 Random -0.555 Purple-bibbed Whitetip_Salvia quitensis
Without random model